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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77077cd1a5d140a0da5df356a7389a2d23f4f650ea7be7d2044ce8804044357e' 
  AND token = 'AotpA2z29rUmZVzGDNuGJ3sDW3ffGIR/zftVOq84vu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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