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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8513ca0b01a2242891c697cb8831a6975fb3abc754410c2f662eadcb57d4528a' 
  AND token = '2KXGeiwQc9eX86jnB078HYw0kTpqEav/H22Z4S7vbFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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