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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea89684680c1e9ef89c106002ac4462bc7f86c4ce79aabb357e0db86b06b3f7' 
  AND token = 'sOoHE3Qg1l5S3XVLM5FSSds56abgeb5xD7l673ZygH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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