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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ccfdc2613721c53169d1cc5e48ff3612b180a47f744c3920d0eb2e0920ec697' 
  AND token = 'VX2FbEC9oSCOS8vP1j75454a8hnjQpQRQv4X102WotU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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