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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7afba2073bc5897b2d970dd0bed3c60bf88f0582d806e81680e4089614df57d9' 
  AND token = '+Ae1ATh8FaarsduJn+WpCrx/oYp44QQszPKq6gcHVVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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