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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f25ce4c10a73e8a0f843f5880de311f905727286595e21db360477664a0f3d' 
  AND token = 'cAeKNdniySk+HKMk0xyHwhyx3iHQxgBjzN5ehBVZatg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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