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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd90238a3e66fb6514738cc820b543179de66bc33382d774ad9dc92f27085186' 
  AND token = 'OCJmf3caI6869XJSJWW6LZYEV+HgXSJae4zGD9vW7Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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