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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '484ed1f82d09f0e82cc3f2f414371be38fe38de328e9c4ae1f26c35d6f7b5f4a' 
  AND token = 'smxFp7GtgxD3djxftzOoFPuL/F9e35OFSea7X86hgeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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