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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d3e59ba35d39506f979076b08107edf827b710e581c550ded724e8366dd2db' 
  AND token = 'ivD3BmxzLGjB+wpfZt2iw0dUhcMc1oWgFDdzzee7Hy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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