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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3fa40925fd938f40ef96cdd5a0968bfbc71f652a3679b3b4c723b890c0c2772' 
  AND token = 'LyhhEvV7y0I1UruONjdITRVZDopjKkm2IsbPBT9h2U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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