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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a4c767c4b9e2d75ef764e27c5eb43c7d2db14a90475d14240fd847c72d2093' 
  AND token = 'G7c6IKkrqn6weO0eLZex8ms2UaJvzP5vSoFZCYSrEEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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