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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f3e3455c4200a8060bcdb89c777ade2cfcadd7265916f84c8588a32ef0b600' 
  AND token = '0pKZsjsic32RuGeeaQ5SbGnUoMf3tLny+Q0f90ZvkgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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