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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e045ab03c7b0112c93bd57fd44ab79c95fe1b91311b7e2e091522d36bc4e292' 
  AND token = 'EmHwfhoJxZ31FRuYsQZFLm5S4Bt7bOpdsY7PF2/Fr7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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