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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eebadf15cabedbdd323c11a4ba86fb6bf94e3cc3f303240ef06652842335ff27' 
  AND token = 'jPs/y1qm2r9TwA64p1CORyvSCHdmjDslIexiYsnbxMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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