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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2229d0b5ca771e46658c706cd09f191f6f53037849750d3b0551e72037bae01' 
  AND token = 'SPuFcR23ldENr28/O2SW03UJDN/t0t22F0AYdf8c7jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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