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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ef4efdd0b177a78582476d4b548404893065294c1f4d5403f5afe9ee17cbbd5' 
  AND token = 'Q2bEwHI91G4tjnGwWhgnybcUWxSic8u0TDG+Yha1JDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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