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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee37e69492c484364c66c479616b1954b1e9bd57032241e87cf6ded19122543' 
  AND token = 'DyvCm2csesg/rvJaKUrJ6q6hV3X6FlqLIFNSvzRJcdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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