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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa951abe7c1c8a84e32614d4a8a98da87ad366d19d33b8972379088703e1a01' 
  AND token = 'XlH+HNcFECT48K/R+b2jW873Q32UU9FJRSL2rbRXZzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}