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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ca30e14ef8a412e209363be94580b063dd6f40a25889caeb97e65ee4ce0d15' 
  AND token = 'drlwEc2VcV0j3lfypJBmLiIqfaLMYfzZGkcZOSAfZKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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