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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '261ea937bf7d1c4dc774e651307dfaa73c0095061438df487aa7b63f1d2b400d' 
  AND token = 'a1XGPY91l5owp4PTRvRRAqF1c6G248vZmZX8fBclwK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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