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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6d1bf5ab9e04d5e0c213dba6a82ff3357c4191555933a194d8596e6be54923' 
  AND token = 'cAmovSWD4Z+wtZogzSiM2D7o+K93A1JfUWKUdQzqTQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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