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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '958964cf7749e4814fdcfae8d52b5a0f055b0285c30743c6889a92b3b5197a21' 
  AND token = 'iP3Fxm1jXEk/M7dQUL6U4HI6aYBnOtvT4cKw/Zkb6IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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