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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6d8d2b3d6d0576cf2cdd7bd9264f93cb6dc6af9c5623014794304e3a1679ba5' 
  AND token = 'kNxr9g8kf3OXOnMbzPFxb1ClR9hcllF3A2YYEax7KT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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