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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f18540de0e7a92e853d3c56bfad6b71b57af11ad43979ca6f265c22ea5823e3' 
  AND token = 'rXyib5+jc/mfimAUUV8Rgm8F8FfDZ7tXlVBJ06shm9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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