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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a247eb95db47d8f2b1d09053bf754b0a41b870db0f98ae5ec7bec26cab795d61' 
  AND token = '5U9aL248D1r7GkEJQuIzUG7xjKx3n3zalTBdc1DPjzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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