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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a4365d5026cfcc12eabde6c342c55e849a119c90548844765f5a98f69233732' 
  AND token = '01l5yK3oCGHs1R4jwZismWaoAMyCpHLdYl9NjEQ6F4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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