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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee0a4c62c2f47c74436ea8a1715b2ab4ef62e5852f9a2b75ab4474070bd68010' 
  AND token = 'K/h56BPzTDnUWKdAV5e1Y8VwBK8gGmbc85TzRr2mg+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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