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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd73b2321f21f3c243e786b98fb197a756d3d83a124b41910c81c38c51c1ed8f0' 
  AND token = '2D8JK7JRHY5veGDxV2rz5f43LIR+hxEcJ14rA/qnCu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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