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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb942ed19b826f7697bebb25cc8004e4f955b90a9d499bebabe52c1b10145c9a' 
  AND token = 'JZ0kpPsG1xuABDIhJCDQgSiC2x8KpKLN2KCqWszWbSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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