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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7090c9f2091c73d423dd81559c3acbbedde994caa5018e2373fce82f3a58bf34' 
  AND token = 'EkH0qRyc3JE2JT42uRpfh9V1TYG9j+o0i9BxDFfDZ8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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