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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f2b93bdc6a67ef0ea7a05efc1729318280d0cfad3827d8ffaf3a7c613f05b6' 
  AND token = 'dra3iRyLFzslUOI8nv4FuEBTU7AmETugLaUDLFD8mHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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