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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e20fdddf739887371fb94e0a1ae0d730c8594f8d84514c28c71644a8f6e85c89' 
  AND token = 'ZnkpitP97FKALjRyP5v5RVQOW+RH2sgCMl+Sb3Y+94U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00132

JSON explain

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