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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d886035c7bfa44d76716bf1cacf99475620743b1ef8dc3cd843825ce3cadb8' 
  AND token = '+90HuagHROx0rQ3RXHtdp87YzNTeketrqSgYZbobUlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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