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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4fdb7dfd8730875fd0be2ea018c1045ce90fe1b54e4df550255963600982ecb' 
  AND token = 'WrMsDfmPhzVcMxb+AA8CsXqUuc5Fx1GC2lqR2o6WzWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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