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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce753bc59fe77e3af27e991d18b2e73d1e341b22f0f961b7a7b7e7852eee5909' 
  AND token = '76Ry099XWQKNpWKI/gcU3ElPDfPe+IY0vtIptXylH14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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