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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9093fe23c0dcd0a5744dfafc085688eb66d09af97315cd3836502734870264a0' 
  AND token = 'lZFVltr6EC0Fbr35xk/szvo0jSDH2QAH+RSHayTwglg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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