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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc4bf1141731d73fb64932c01cbe2a35b1888f19344562378e4f94305c2847ec' 
  AND token = '02vNUyelvXZf/IcvsISWYNUq4Mx9WBQ7bPE6gpj6OoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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