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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7da917aa770a541e3e0cc5b7498feb8364f1ae506c33afda23e8057a052eb6e' 
  AND token = 'LL20L3+o2NQT/xFwakcq/KLy/7s1jFitrbq/bjTqyG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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