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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6f544294516a18419f31af14f78c3a67f5e4824f85a7e23bae02d2e9754aa2' 
  AND token = '27TFl6Multvp1xue41TTx9VInWMmvh7xyHwrnHIrpvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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