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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8eb6ab5f565e3042c6fb4a2c0a5828bdbfc0cafdd9e5fce851bd45f0e2362a5' 
  AND token = 'CjLT0AWCSxUuChKG583mgKbZBe10NuUBgYz0Y1W7Gxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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