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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c4afe18881c97ce9b781731536b2dd6532af4933d5e692b846f65bde7fb3e6' 
  AND token = 'dlib0u2HgzELl9MICVvRLnccW+Xz1qkTNRHL7rIUHF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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