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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe9dead4c3e1a9045b73eb1ee861a7c8c2deff86af39c0b1aa9e3ecc583d9a9' 
  AND token = 'BTgL/eu0D/e1g99YVLLAnAU5os0Wch9rOitAulP8kJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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