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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1e214d5053bf6c462a247d13c99a8dc5b1e41b9307d7b92cff12be19b9d5ef8' 
  AND token = 'NPzTr981P3hI7SNV1/2nE0IK7tGu2XduOPse2sKI240=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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