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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d5a96562102823ff886080d79f5e49900148fe3b3d93fe2fd1ca29dee2362e1' 
  AND token = '2jZH2O99/PC3Zbkgw3j3Bhp3Ol0NC2Lz2gMu+o0LrWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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