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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d635cb3a2c195bbc93922d59c68f4e1c7e8525ee517a04b0d851a048e5eac5' 
  AND token = 'IFMhFQ8WOkbI1kHb6/NQmASid9HPaRhMlYFZPaEonbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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