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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f347313d00ebc304a24b6710aa0ad9039fd99d00ce3d01c243bb4b936067f7' 
  AND token = 'pzTUVr1j+UN9ChyddghY8F0DHborS58Byg1GEAbCqos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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