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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a71c9823cea9197f01c03451526327b0093043507fa2d6bc0e55c179af060c' 
  AND token = 'e9VOTKjhrRf3nSyT4+bURKxbk6+EAL0CRI6PkgR2t2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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