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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055ec3b8588e5593a70a0d721061f4d0f0e5bdcfefd3df08663d4248d1df60ba' 
  AND token = 'uAaxPiMC/tpqVYFTl+eYk6Tj7LZvvxD77BvN3ZIth7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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