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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632f3d146bc14669e4f5772950addee165a40a8e10dc38fbf8c96be5ddaac1aa' 
  AND token = 'Lxqpovc7IIxjobEX7aL0aczgeENUb3LETKt/VCwbXHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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