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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e75a78259e8bc808f9923ba19c3c8432bf5d735b2e20014974b73f01bae659f' 
  AND token = 'vEbnJghX8CPAh7YhQuR3lnlVHDe2Lh1SJlAlzbLefCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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