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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cc2add1850ae7f202b2bb8327a54fcf88a469182c30c4993dc93718baca1689' 
  AND token = 'CRH3rIUJufJOIijooJecK9LBqFOihJydACOpjQGAUm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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