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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad07bdefe17f8a2132cfce784b3b2027bc72e6dd925cdaee7c56e3b0ede4b4a3' 
  AND token = 'Ynov3cykIQqiPwdqkOiQM3H/5RhXIcz7/tIlgnodobk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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