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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f11025a40deec133a261b38042673c47dd07530174dd5cf67d56505a3e4d82' 
  AND token = '/Cq4PHQqczMNW0BbCPdyVfNZjO3T1l8d59H2Sjjuoyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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