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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27c039a575150913ae61c509478775abf0330fe60d1b1510b38751517ef9b75e' 
  AND token = 'WFOdsVHc2hFzCG/Lyi65nbcMmmhl0Zze9spShFYjOvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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