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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a76a945fa20a7a31b4a0bd9aa28ca1a51d0705fd4ca27c97f6b0c925e40bc0' 
  AND token = 'LAvpCLU9yO1OTDLiHzeTnfBXFodoe0sIpmIPE3YRSm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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