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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b7cd549fd60cd4997c3478afba56861a9e23ca8ef7f0b926651781c450176db' 
  AND token = 'f5+WNK5zqO4VpFG1r5LXFbRpFs8dSP0mS/y1cmPMuj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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