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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64b3511f949bee959a0cfcb14b6f183ef169a6e66af2d0ef0aa35c972c49ac67' 
  AND token = 'cT7UnRQrUEnLeq2FxlD6ghL/d1rZ2w/G1TCugjkc5Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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