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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ab1d00afe65ebf9b7a8b1e3cbcf9d3d1081764cd707ed2122d03d11705cff0a' 
  AND token = 'IfPqa2SOXOQj0L45Ds/irKI1s8ePin0R3SHnR90rsxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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