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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e708ad7be1f108e7f1e0a34bb86891af8d36384147487362d1bed8111fe3a29' 
  AND token = 'osTNnUd9BngSyByV9PIm6kfUP6x+s2rQta/5Drld2cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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