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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef84bf431433a3c2e147b5e7709b6c06f01af1afa27e46869426278564fac1fe' 
  AND token = 'gEzqJqYQelEPQv+UhDkDCi8yh2oXf7EtR9kiZkFXa9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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