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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833ae61a330ca86844ca2d9fb4849eaf5287c398c9e36d18390d074826e639f3' 
  AND token = 'YKe2Y9BLyu7WwzO9H9Mx+WVZqF/d0KX1uJO75YWYdmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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