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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2bec3cd5ad31b11114f475581df1e5d4720ba93e77c4dae635ac96c982a6520' 
  AND token = '4XUvgYPVYOWzvvBsZPQyFAH7NBRcVi18Yelfu338YC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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